RDP E725 User manual

RDP Customer Document
Technical Manual
E725 Microprocessor Based
Transducer Indicator/Controller
AC INPUT VERSION
Doc. Ref CD1420T
This manual applies to units of mod status 6 ONWARDS
Affirmed by Declaration
of Conformity
USA & Canada
All other countries
RDP Electrosense Inc.
RDP Electronics Ltd
2216 Pottstown Pike
Pottstown, PA 19465
U.S.A.
Grove Street, Heath Town,
Wolverhampton, WV10 0PY
United Kingdom
Tel [phone]
Fax [phone]
Tel: [phone]
Fax: [phone]
E-mail [email protected]
www.rdpe.com
E-mail: [email protected]
www.rdpe.com

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INDEX
1INTRODUCTION..........................................................................................................5
1.1 E725 AC Input Version............................................................................................5
1.2 How to Use This Manual.........................................................................................5
1.3 Part Number Structure............................................................................................6
2EMC DECLARATION & SAFETY TEST INFORMATION.............................................7
2.1 Electrical Safety Checks .........................................................................................7
2.2 EMC Compliance....................................................................................................7
2.3 Certificate of EMC Conformity.................................................................................8
3INSTALLATION............................................................................................................9
3.1 Power Supply Voltage Selection and Connection...................................................9
3.2 Display During Power-Up........................................................................................9
3.3 Changing the Fuse................................................................................................10
3.4 Panel Mounting.....................................................................................................10
4FRONT PANEL DETAIL & EXTERNAL DIGITAL INPUT CONTROLS ......................11
4.1 Display Features...................................................................................................11
4.2 Control Key Functions...........................................................................................11
4.3 External Digital Input Controls...............................................................................12
5TRANSDUCER CONNECTION DETAILS..................................................................14
5.1 Transducer Connection Overview & Specification ................................................14
5.2 Connection for LVDT Transducers (With LVDT Schematic) .................................15
5.3 Connections for Differential Inductance (Half Bridge) Transducers.......................15
6PROGRAMMING........................................................................................................16
6.1 Programming Overview.........................................................................................16
6.2 Menu Access.........................................................................................................16
6.3 Number Entry........................................................................................................17
6.4 Menu Item Selection .............................................................................................18
6.5 Front Panel............................................................................................................19
6.6 Edit Passwords .....................................................................................................19
6.7 Filter......................................................................................................................20
6.8 Count Facility ........................................................................................................20
6.9 Returning To Normal Operating Mode..................................................................21
6.10 Menu Map.............................................................................................................21
7CALIBRATION............................................................................................................22
7.1 Calibration Overview.............................................................................................22
7.2 Gain Range...........................................................................................................23
7.3 Decimal Point........................................................................................................24
7.4 Calibrate Input.......................................................................................................24
7.5 Linearise Input.......................................................................................................28
7.6 Engineering Offset ................................................................................................28
7.7 Tare Point..............................................................................................................28
8ANALOGUE OUTPUT................................................................................................30
8.1 Analogue Output Description ................................................................................30
8.2 Analogue Output Connections & Specification......................................................30
8.3 Analogue Output Calibration.................................................................................30
9LIMITS........................................................................................................................32
9.1 Limits Description..................................................................................................32
9.2 Connections and Specification..............................................................................32
9.3 Programming Limits..............................................................................................34

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10 MAX /MIN (PEAK CATCHER).................................................................................36
10.1 How to Identify if Your E725 Has an Option FM Card Fitted.................................36
10.2 MAX/MIN Description (E725 Without Option FM) .................................................36
10.3 MAX/MIN Description (E725 With Option FM) ......................................................36
10.4 MAX/MIN Connections and Specification (E725 Without Option FM) ...................37
10.5 MAX/MIN Connections and Specification (E725 With Option FM)........................37
11 RS232/RS485 OUTPUTS.......................................................................................38
12 TWO CHANNEL VERSIONS..................................................................................39
12.1 Description............................................................................................................39
12.2 Connections for Second AC Input Channel...........................................................39
12.3 Calibrating the Second Transducer.......................................................................40
13 SPECIFICATION.....................................................................................................41
14 GLOSSARY OF TERMS.........................................................................................42
15 APPENDIX 1 –DIMENSIONAL DETAILS ..............................................................44
16 APPENDIX 2 –COMPLETE CONNECTION LISTING ...........................................45
17 WARRANTY AND SERVICE ..................................................................................46

5
1 INTRODUCTION
YOU DO NOT NEED TO READ THE ENTIRE MANUAL.
Read this section to find out which sections are important.
1.1 E725 AC Input Version
There are several types of unit in the E725 range. This manual is specifically for use with
E725 units fitted with ac input board(s). Before proceeding, please check that the part
number (located on a label on the E725 housing) has the following structure.
E725-XXX-AC-X-X-X where X is unimportant for the purposes of this exercise.
The AC input E725 is designed to work with a wide range LVDT and half bridge inductive
transducers. It provides a display for AC type transducers. It has an analogue output
(voltage and current) and four limits as standard. It has excellent dynamic performance
and several sophisticated features. One of several option boards can be factory fitted.
1.2 How to Use This Manual
This manual contains all of the information needed to connect and calibrate your
transducer. Please spend a little time to read & understand the relevant sections. It is not
necessary to read all sections. Please use the index to select the relevant sections.
It is possible that the unit is already calibrated with a transducer. If you have purchased the
unit with a calibration then you can probably ignore all sections concerning programming
and calibration.
If your unit is not calibrated then read Sections 3, 4, 5, 6 and 7 as a minimum.

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1.3 Part Number Structure
SUPPLY
230
= 230V ac +5/-15%
115
= 115 " "
105
= 105 " "
5
= 5V dc +50/-10%
12
= 12 " +50/-25%
24
= 24 " +50/-25%
INPUT BOARD
(One must be
chosen)
AC
= for LVDT/half-bridge etc.
DC1
= for strain gauge & amplified trans. (±15V supply provided)
DC2
= for amplified transducers (24V supply voltage provided)
DC3
= for RDP D2 series transducers
OPTION
BOARD (None
or one may be
chosen)
0
= none
R
= four mechanical limit relays
RS
= four solid state limit relays
FR
= fast limits with two mechanical relays
FRS
= fast limits with two solid state relays
FM
= fast MAX/MIN board
2AC
= Second LVDT/Half-bridge input
2DC1
= Second DC1 input
2DC2
= Second DC2 input
2DC3
= Second DC3 input
SERIAL
OUTPUT
0
= RS232
1
= RS485
SPECIAL
OPTION
0
= None
Example:-
E725-230-AC-FR-0-0
…has 230V ac supply, and AC input board, a fast limit card,
RS232 output and no special options

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2 EMC DECLARATION & SAFETY TEST INFORMATION
2.1 Electrical Safety Checks
This unit is designed to comply with EN 61010-1 "Safety requirements for electrical
equipment for measurement, control and laboratory use". The specification complies with
the EU Directive 2014/35/EU concerning low voltage electrical safety.
This unit was checked for electrical safety, using a portable appliance test unit, prior to
despatch.
If the user wishes to carry out his own PAT tests, the following points must be followed.
1) This Safety Class 1 apparatus has a low fuse rating (<3A), and a low current rated
power connection cable.
2) It is recommended that when carrying out an earth bond test (BS EN 61010-1,
Section 6), the test current of 25A should not be applied for more than six
seconds.
3) In general it is not recommended that high voltage (e.g. 1.5kV) insulation tests are
carried out (BS EN 61010-1, Section 6). This could cause damage to suppresser
components.
2.2 EMC Compliance
This unit is designed to comply with EN61326-1 "EMC requirements for electrical
measurement equipment".
For full EMC compliance, only shielded multi-core cables should be used for connection to
this unit; the cable shield to be terminated by means of a short "pig-tail" and connected as
detailed in relevant sections of this manual.
The metal rear panel is used as a ground connection for all cable shields. The panel is
internally connected to the supply earth wire that must be connected to a reliable ground.
Notes:
1) Cable shields to be earthed at only one end - the E725 end.
2) Ensure cables to and from the unit are routed away from any obviously powerful
sources of electrical noise, e.g. electric motors, relays, solenoids and electrically
noisy cables.
3) Ideally, the transducer body should not be connected to the cable shield, but should
be separately earthed. If the transducer fixing attachments do not provide a good
earth, then an earth strap should be used.

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2.3 Certificate of EMC Conformity
DECLARATION OF CONFORMITY
RDP ELECTRONICS LTD.
Grove Street Heath Town
Wolverhampton West Midlands
WV10 0PY
United Kingdom
We declare that the product described in this technical manual is manufactured by
RDP Electronics Limited and performs in conformity to the following:
The Electromagnetic Compatibility Directive 2014/30/EU
The Low Voltage Safety Directive 2014/35/EU
The ROHS2 DIRECTIVE 2011/65/EU
R D Garbett
Director
RDP Electronics Limited

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3 INSTALLATION
3.1 Power Supply Voltage Selection and Connection
Check the supply requirement for the unit using the part number located on the outside of
the unit housing:
E725-XXX (ignore the rest)
If XXX =
5
then supply required is
5V dc, 7W
+50/-10%
dc Supply
If XXX =
12
then supply required is
12V dc, 7W
+50/-25%
If XXX =
24
then supply required is
24V dc, 7W
+50/-25%
If XXX =
*105
then supply required is
105V ac, 7VA
+5/-15%
ac Supply
(50 - 60 Hz)
If XXX =
*115
then supply required is
115V ac, 7VA
+5/-15%
If XXX =
*230
then supply required is
230V ac, 7VA
+5/-15%
*In these cases check that the supply selection slider-switch is correctly set.
The E725 is fused internally but it is recommended that the unit be externally fused also.
We suggest a fuse of a slightly lower rating to the internal fuse (details in Section 3.3). As
the unit has no internal power switch it is recommended that an external means of
disconnection is fitted in a convenient location, e.g. SW or C.B., etc..
The ac power supply is connected to the three-core 2m long integral cable as follows:-
Cable Core
Supply
Brown
Live
Blue
Neutral
Green/yellow
Ground (Earth)
The optional dc supply, has integral 2m, two-core shielded cable as follows:-
Cable Core
Supply
Red
dc volts positive
Blue
dc volts negative
Shield (connect to good ground for optimum EMC)
0v/ground
3.2 Display During Power-Up
On power-up the display shows the following before assuming normal operating mode:-
Step
Display
Brief description.
Example
1
E725
The product model number
E725
2
X.XX
A number indicating the software version
1.00
3
AC-X
AC input. X =option card 1 to 4
AC-1
4
XX.Y.Z
The serial communication settings
00.0.4

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3.3 Changing the Fuse
As the fuse is inside, it is necessary to open the unit in order to change the fuse. Firstly,
please obtain the correct fuse as shown below. Section 3.1 details how to identify the
power supply required by your unit.
230V ac,115V ac &
105V ac
units require a
250mA
anti surge (A-S/T type) 20mm long,
5mm diameter.
5V dc
unit requires a
3.15A
anti surge, 20mm long, 5mm dia.
12V dc
unit requires a
1A
anti surge, 20mm long, 5mm dia.
24V dc
unit requires a
0.5A
anti surge, 20mm long, 5mm dia.
DO NOT USE ANY OTHER VALUE OR TYPE OF FUSE. IT WILL INVALIDATE THE
GUARANTEE, IT IS DANGEROUS AND IT MAY CAUSE A FIRE.
How to install the fuse.
1) DISCONNECT THE POWER AND ALL CONNECTORS FROM THE UNIT.
2) Place the unit on an anti-static mat and wear earth strap on wrist.
3) Remove the four screws, one at each corner of the rear panel.
4) Hold the power supply cable grommet and pull the rear panel and circuit boards
gently from the unit.
5) Remove the two screws that hold the power supply board. The power supply board
is on the top of the unit, at the front (near the display).
6) Lift the power supply board to reveal the fuse.
7) Replace the fuse and re-assemble the unit.
3.4 Panel Mounting
This unit may safely be used on a bench or as a portable unit providing that it is not
mechanically damaged (by dropping etc) and providing that the supply cable is not
damaged.
It may also be installed into a panel if desired.
Panel mounting procedure
The maximum acceptable panel thickness is 12mm. A hole must be cut in the panel 93mm
wide and 45mm high. Pass the unit through the panel by firstly feeding the cables through
the hole from the outside (front) of the panel and then inserting the unit rear end first.
From the inside of the panel fit the panel-mount clips into the slots on the side of the
housing and tighten until the unit is firmly fixed into the panel.
Sealing the front of the unit in a panel.
The membrane keypad of the E725 is sealed into its housing. In order to achieve a seal
into the panel, silicone sealant should be applied liberally between the front of the panel
and the rear of the unit bezel. This is best done prior to tightening the unit into its panel.
The degree of protection is dependent upon how well this job is done but IP65 is possible.

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4 FRONT PANEL DETAIL & EXTERNAL DIGITAL INPUT CONTROLS
4.1 Display Features
The up arrow indicates that the display is showing the MAX value, the down arrow
indicates that MIN is being displayed and both together indicate that the TIR is being
displayed. (Section 10 refers). The horizontal bar between the up and down arrows
provides the negative indication when all 5 digits are in use.
Four control keys provide
functions as described in
section 4.2.
The E725 has 5
digits each 13.2mm
in height.
Four LEDs (F1 to F4)
show the display function
MODE. These LEDs are
not used on units with a
single input unless
calculated channels are
assigned (Sections 11
and 12 refer).
The white area below the centre of the
digits provides space for one of the
legend labels (supplied) to be fixed.
Four LEDs indicate
the status of the
LIMITS. An
illuminated LED
indicates that a
particular LIMIT has
been triggered
(Section 9 refers).
4.2 Control Key Functions
The E725 has four membrane keypads with tactile feedback. These keys select and
control the functions of the E725. This section concerns itself only with the functions
available in the E725's normal operating mode, it does not detail any of the programming
or calibration functions.
Key functions. In order to...
Press…
Zero the display
ZERO
ZERO
Return to calibration zero (clear Zero)
ZERO
ZERO
& RESET
SETUP
RESET
together
Change display (MAX to MIN to TIR to
NORMAL)
MODE
MODE
Reset (MAX & MIN & TIR)
MODE
MODE
& RESET
SETUP
RESET
together
Change function mode (if available)
MODE
MODE
& FUNC.
ZERO
together
Check the integrity of certain amplifier circuits. A
standard E725 AC should show 1.100 APPROX.
MODE
MODE
& CAL
LIMITS
ENTER
together
Reset latched limits
LIMITS
LIMITS
ENTER
& RESET
SETUP
RESET
together

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4.3 External Digital Input Controls
Connections are made via the 15-way connector as shown below.
4.3.1 Opto-Isolated Inputs
Digital Input functions. In order to...
Apply 5-50V between pins…
Zero the display
(14 and 10)
Return to calibration zero (clear Zero)
(14 and 10) AND (14 and 12)
Change display (MAX to MIN to TIR to NORMAL)
(14 and 9)
Reset (MAX & MIN & TIR)
(14 and 9) AND (14 and 12)
Change Function mode (if available)
(14 and 9) AND (14 and 10)
Test amp circuits. Should display 1.100 APPROX.
(14 and 9) AND (14 and 11)
Reset latched limits
(14 and 11) AND (14 and 12)
Freeze Display (Digital HOLD)
(14 and 12)
Perform a fast analogue hold.
(14 and 13)
Connections are made via the 15 pin D type connector (labelled 'DIGITAL I/O') on the rear
panel. In order to activate the functions a voltage of between 5 and 50V dc is applied
between input com. (pin 14) and the required function pin. As the inputs are opto-isolated it
is best to use an external supply as this gives the best protection for the unit against
electrical interference. If this is not possible, a 5V output available from the same
connector may be used, but opto isolation will be lost. If the 5V output from the E725 is
used, the common (pin 14) must be grounded by connecting it to pin 8.
15 Pin DIGITAL I/O connector. Pins available for digital inputs.
Pin Description
8. Ground
9. Same as MODE key for these purposes
10. Same as ZERO key for these purposes
11. Same as LIMITS key for these purposes
12. Same as RESET key for these purposes and also digital HOLD.
13. Fast analogue HOLD.
14. Common for all digital inputs
15. +5V supply for digital i/p. If used, common (pin 14) must be linked to ground (pin 8).
Example of resetting MAX/MIN
Using an external power supply
Using the internal 5V supply output

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4.3.2 Digital Inputs –Specification
Function
Min. pulse
Response
Droop
All digital inputs except hold
200ms
200ms max
N/A
Digital hold, remove signal to release
200ms
200ms max
None
Analogue fast hold, remove signal to release
0.1ms
0.1ms
1 digit/sec typ.
The fast analogue hold freezes both the display and the analogue output. Because it is
held as an analogue voltage, it is prone to droop. For best results, Applying the hold to the
digital hold 200ms after the analogue hold (a simultaneous hold may be acceptable) will
eliminate display droop. However, the analogue output will still droop.

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5 TRANSDUCER CONNECTION DETAILS
5.1 Transducer Connection Overview & Specification
The E725 AC provides the excitation voltage for LVDT and inductive type transducers, as
well as having a demodulator to convert the ac signal returned from this type of transducer
back into a usable dc signal.
CONNECTIONS TABLE for 9 pin D type connector labelled 'TRANSDUCER'
PIN
Pin designation for input card type AC
Comments
1
Excitation high
The polarity of these connections does not
normally matter. See "INPUT PHASE" below.
2
Excitation Low, 0V (Ground)
3
Signal low
The polarity of these connections does not
normally matter. See "INPUT PHASE" below.
4
Signal high
5
0v (Ground)
6
Master/Slave Link pin (see below)
To synchronise E725s in close proximity.
7
Bridge completion resistor (exc. High)
Only necessary for half bridge type
transducers
8
Bridge completion resistor (common)
9
Bridge completion resistor (exc.low)
Shell
Cable shield
Input phase.
In most applications it is desirable to have a displacement reading that increases as the
transducer moves outward. The above connections reflect this. If however your application
requires the reading to increase as the transducer moves inward, reverse the excitation
connections (pins 1 and 2), which will reverse the polarity of the display.
Master/slave link.
This pin is not normally used. If a number of E725 units, or the transducers connected to
them are used in close proximity, there is a possibility of interference. This interference is
called 'frequency beating' and is analogous to the audio effect exhibited by twin engined
aircraft. In order to eliminate this, the oscillators of the E725 units can be connected
together thus synchronising them. If you are using, or intend to use E725 AC units in close
proximity and require extreme accuracy, please request document CD1432 from RDP.
This gives instructions on the internal changes necessary to synchronise the oscillators of
more than one E725 AC.
Specification for AC Input Card.
Excitation Voltage
1.1V rms., 30mA sinusoidal
Excitation Frequency
5kHz
Input Impedance
100k Ohms, Differential
Demodulator Type
Synchronous, with active filter
Linearity
±0.05% F.S.
Input Signal Range
F.S. output/display can be achieved for inputs of 0.015 to 4V rms.

15
Temp. Coefficient
Zero :-±0.002% F.S./°C Typical. Gain :- ±0.005% F.S./°C Typical
optimum at ± full scale.
Excitation amplitude :- ±0.005% F.S./°C Typical
5.2 Connection for LVDT Transducers (With LVDT Schematic)
See also ' INPUT PHASE' above.
The E725 does not require the connection of the secondary centre tap.
For transducers which have a 6 wire connection (i.e. the two secondary coils bought out
separately), connect the secondary coils together in series, with one of them reversed, so
that they are in differential mode. Connect the series secondaries as if one coil, as shown
below.
Exc. Hi = PIN 1
Exc. Lo = PIN 2
Signal Hi = PIN 4
Signal Lo = PIN 3
Connect shield to
connector shell
5.3 Connections for Differential Inductance (Half Bridge) Transducers
See also ' INPUT PHASE' above.
Exc. Hi = PIN 1
Exc. Lo = PIN 2
Signal Hi = PIN 4
Connect shield to connector shell
ADDITIONALLY,
Fit 1k Ohm, high stability resistors between pins
(7 and 3) and (8 and 9)

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6 PROGRAMMING
6.1 Programming Overview
Various features of the E725 are user-programmable. This section of the manual outlines
the general approach to programming and describes some specific programming steps.
Reading Section 6 should enable the user to access menus, enter numbers, select items
and programme some specific features. Programming detail relating to calibration, limits
and two channel operation are covered in Sections 7, 9 and 11 respectively.
SEVERAL EXAMPLES ARE GIVEN,THEY ARE HIGHLIGHTED IN BOXES AND BY THE USE OF THIS FONT.
THOSE IN BOLD PRINT ARE LIKELY TO BE PARTICULARLY USEFUL TO THE FIRST TIME USER.
It is possible that the E725 has been supplied factory calibrated for use with a
specific transducer. In this case, programming may be unnecessary. Care should be
taken if programming is attempted as errors may cause the loss of calibration data.
6.2 Menu Access
The E725s programming procedure is based on a menu approach. There are three menus
which are called the CONFIGURATION, CALIBRATION and USER SETUP menus.
Access to the menus is protected by three passwords called P1, P2 and P3. Each
password is in fact a five digit number (i.e. five digits including leading zeros and sign).
The factory default values and access provided by each password are as follows: -
Password
Default
Access
P1
00001
USER SETUP menu
P2
00002
CALIBRATION and USER SETUP menus
P3
00003
CONFIGURATION, CALIBRATION and USER SETUP menus
It should be noted that the procedure for accessing the CONFIGURATION, CALIBRATION
and USER SETUP menus is almost identical. The only difference is the user level which
has to be selected and password which has to be entered.
Each menu offers several items, which allow particular features to be programmed. Once
a menu has been accessed, the user can step forwards and backwards through that
menu, making particular items appear on the display. Once an item is displayed it can be
selected to allow a feature to be programmed.
The structure of CONFIGURATION, CALIBRATION and USER SETUP menus is shown in
Section 6.10.
The CONFIGURATION menu automatically leads in to the CALIBRATION menu which, in
turn, automatically leads in to the USER SETUP menu. In this way the CONFIGURATION
menu gives full access to all user-programmable features.

17
EXAMPLE A
TO ACCESS A MENU FROM THE UNIT'S NORMAL OPERATING MODE,PRESS THE SETUP KEY FOR AT
LEAST ONE SECOND.THE DISPLAY WILL SHOW THE PROMPT [UL 1].PRESS THE ▲OR ▼KEY
TO STEP THROUGH THE VARIOUS OPTIONS,WHICH ARE:-
DISPLAY
ACCESS
[UL 1]
USER SETUP MENU
[UL 2]
CALIBRATION AND USER SETUP MENU
[UL 3]
CONFIGURATION, CALIBRATION AND USER SETUP MENU
WHEN THE REQUIRED USER LEVEL IS DISPLAYED,PRESS THE LIMITS KEY TO SELECT THE
DISPLAYED OPTION.THE DISPLAY WILL NOW SHOW A NUMBER ENTRY PROMPT [00000] WITH THE
LAST DIGIT FLASHING.AT THIS POINT THE RELEVANT PASSWORD SHOULD BE ENTERED (SEE
SECTION 6.3 FOR NUMBER ENTRY.)
6.3 Number Entry
Certain programming steps require number entry. When number entry is required, the
display shows a five-digit number with the last digit flashing.
The password number entry prompt is [00000].
In other cases (for example ENGINEERING OFFSET) any existing value is shown. For
example, if the existing value of ENGINEERING OFFSET is 1000, when ENGINEERING
OFFSET is selected, the display shows [01000], and the last digit is flashing.
Pressing the UP-ARROW and DOWN-ARROW keys increases and decreases the flashing
digit in the range 0 to 9.
Pressing the ENTER key accepts the current digit and causes the next (to the left) digit to
flash. The user must enter the required number working from right-to-left across the
display. The number contains five digits including leading zeros.
Pressing the RESET key at any stage in the number entry process discards changes and
restarts the process. The original existing value is displayed with the last digit flashing.
This is the only way of moving the flashing digit to the right.
A minus sign is entered with the most significant digit (i.e. the one to the left of the display).
When the most significant digit is flashing, pressing the UP-ARROW and DOWN-ARROW
keys increases and decreases the flashing digit in the range -9 to +9.
When the display shows the required new value, this number is entered in one of two
ways.
1) If the most significant digit is flashing, pressing the ENTER key enters the new
value.
2) If any other digit is flashing, pressing the ENTER and RESET keys together enters
the new value. (This alternative simplifies the entry of low values such as 00003,
the default value for password P3.)

18
In both cases the unit accepts the new value and goes to the relevant menu. The display
now shows the next item in the relevant menu. In the case of password number entry, if an
incorrect password is entered, the unit returns to its normal operating mode.
EXAMPLE B(THIS IS INTENDED TO ILLUSTRATE GENERAL POINTS).
TO ENTER THE PASSWORD -00031 FROM THE PASSWORD NUMBER ENTRY PROMPT.
DISPLAY SHOWS
ACTION
1
00000
PRESS UP-ARROW TO CHANGE DIGIT
2
00001
PRESS ENTER TO STEP TO NEXT DIGIT
3
00001
PRESS UP-ARROW THREE TIMES
4
00031
PRESS ENTER TO STEP TO NEXT DIGIT
5
00031
PRESS ENTER TO STEP TO NEXT DIGIT
6
00031
PRESS ENTER TO STEP TO NEXT DIGIT
7
00031
PRESS DOWN-ARROW FOR MINUS SIGN
8
-00031
PRESS ENTER TO ENTER PASSWORD
(AN UNDERLINED DIGIT REPRESENTS A FLASHING DIGIT)
EXAMPLE C
TO ENTER THE PASSWORD 00003 (FACTORY DEFAULT VALUE FOR PASSWORD P3) FROM
THE NORMAL OPERATING MODE.
DISPLAY SHOWS
ACTION
1
NUMERIC DATA
PRESS SETUP FOR AT LEAST ONE SECOND
2
00000
PRESS UP-ARROW THREE TIMES
3
00003
PRESS ENTER &RESET TOGETHER TO ENTER PASSWORD
AND GAIN ACCESS TO CONFIGURATION MENU
(AN UNDERLINED DIGIT REPRESENTS A FLASHING DIGIT)
6.4 Menu Item Selection
When a menu has been accessed the user can make available items appear on the
display using the UP-ARROW and DOWN-ARROW.
EXAMPLE D(SEE ALSO MENU MAP,SECTION 6.10).
TO STEP THROUGH THE CONFIGURATION MENU,HAVING GAINED ACCESS AS DESCRIBED IN
EXAMPLE C.
DISPLAY SHOWS
ACTION
1
[FP]
PRESS DOWN-ARROW
2
[Edit.P]
PRESS DOWN-ARROW
3
[GAin]
PRESS UP-ARROW
4
[Edit.P]
PRESS UP-ARROW
5
[FP]
To select a displayed item, press ENTER. The resulting display depends on which item
has been selected. The action required once an item is selected depends on the item in
question. Examples of selection of items EDIT PASSWORDS and FILTER are given in the
following sections 6.5 and 6.6. Examples of selection of other items are given in Section 7,
Calibration and Section 9, Limits.

19
6.5 Front Panel
The item FP allows the user to switch the front panel OFF or ON. Switching the front
panel ON allows access to all the normal run-time push button functions (i.e. changing the
display mode, zero etc.). Switching the front panel OFF disables all normal run-time push
button functions except the SETUP key.
When this item is selected, the user enters a sub-menu comprising two possible options
(ON and OFF), The UP-ARROW and DOWN-ARROW keys allow the user to step through
this sub-menu. When the required status is displayed, pressing the ENTER key selects
the displayed status and exits the sub-menu. Alternatively, pressing the RESET key exits
the sub-menu without changing the front panel status. In either case the display will then
show [EDIT.P] (Edit Passwords), the next item in the CONFIGURATION menu.
6.6 Edit Passwords
First time users should make themselves generally familiar with the unit before
attempting to select the EDIT PASSWORDS item. Incorrect actions could result in
the user being locked out of the CONFIGURATION menu.
EDIT PASSWORDS allows the user to change the passwords from the default values
noted in section 6.1. This allows programmed features to be protected by passwords that
suit the user.
When this item is selected, the user enters a sub-menu with three items P1, P2 and P3.
UP-ARROW and DOWN-ARROW allow the user to step through this sub-menu. When the
required item is displayed, pressing ENTER selects that item. The display now shows a
number entry prompt with the existing password value. The password can be changed to
the required new value as described in general in Section 6.3.
EXAMPLE E(THIS IS NOT RECOMMENDED FOR FIRST TIME USERS)
TO CHANGE THE CALIBRATION MENU PASSWORD (P2) FROM 00002 TO 00010, HAVING
GAINED ACCESS TO THE CONFIGURATION MENU AS PREVIOUSLY DESCRIBED IN EXAMPLE
C.
DISPLAY
SHOWS
ACTION
1
[FP]
PRESS DOWN-ARROW
2
[Edit.P]
PRESS ENTER TO SELECT EDIT PASSWORDS
3
[P1]
PRESS UP-ARROW
4
[P2]
PRESS ENTER TO SELECT PASSWORD 2
5
00002
PRESS DOWN-ARROW TWICE
6
00000
PRESS ENTER TO STEP TO NEXT DIGIT
7
00000
PRESS UP-ARROW
8
00010
PRESS ENTER &RESET SIMULTANEOUSLY TO ENTER NEW PASSWORD
VALUE
9
[P3]
PRESS RESET TO EXIT SUB-MENU
10
[GAin]
(AN UNDERLINED DIGIT REPRESENTS A FLASHING DIGIT)

20
6.7 Filter
The item FILTER allows the user to adjust the –3db point of the digital low pass filter. The
digital filtering acts on the display and serial output, but has no effect on the analogue
output. The digital low pass filter has nine possible cut off frequencies (-3db point) as
shown below.
FILTER VALUE
CUT OFF FREQUENCY (-3db)
1
100 Hz
2
75 Hz
3
50 Hz
4
25 Hz
5
10 Hz
6
7.5Hz
7
5.0Hz
8
2.5Hz
9
1.0Hz
When this item is selected the user enters a sub-menu comprising the five possible filter
values shown above. The UP-ARROW and DOWN-ARROW keys allow the user to step
through this sub-menu. When the required value is displayed, pressing ENTER selects the
displayed value and exits the sub-menu. Alternatively, pressing RESET exits the sub-
menu without changing the filter value. In either case the display will then show [COUNT]
(Count Facility), the next item in the USER SETUP menu.
EXAMPLE F
TO CHANGE FILTER VALUE FROM 4TO 5, HAVING GAINED ACCESS TO THE CONFIGURATION
MENU AS DESCRIBED IN EXAMPLE C.
DISPLAY SHOWS
ACTION
1
[t.Pt]
PRESS DOWN-ARROW
2
[Filt]
PRESS ENTER TO SELECT FILTER
3
[Filt.4]
PRESS UP-ARROW TO CHANGE VALUE
4
[Filt.5]
PRESS ENTER TO SELECT VALUE 5
5
[Count]
6.8 Count Facility
(Only applicable to instruments mod. status 8 onwards)
This facility allows you to enter a number which will force the calibrated input signal to be
displayed in the specified resolution. For example, if the display resolution is 2 decimal
places and 25 is entered, then the calibrated input signal will be displayed in increments of
0.25 (e.g. 0.00, 0.25, 0.50, etc.). Example G details how to change the count value.
Filter values 6-9
are only applicable
to instrument mod.
status 8 onwards